Here's a picture of one I'm working on. I used the same fabric in the center of all the 9-patches and different fabrics in the rest. I kept the outer corners all darker than the rest. Then I put sashing and a similar turquoise for cornerstones to what I used for the center of the 9-patches.
I was doing so good on mine, then decided to stay up late one night to assemble the top...lesson for that day: put away the rotary cutter when tired!!! I cut off the extra "points" so I could get an idea of how it was going to look. Unfortunately, I cut off a block too soon on the sides and have to do lots of ripping and make more new blocks to fix it. I also made it too long. I had to put it aside for awhile because I was so depressed about it. But I will get back to it again. I love the colors.